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Without getting into specifics, Porsche's marketing chief has indicated that more plug-in hybrids are in store for the German automaker. But just which model or models will be the next to plug into the grid?

We all know that the letters GT stand for Gran Turismo, but tacking on another letter can evoke a different meaning altogether. GTO for Ferraris (or Pontiacs), GT-R for Nissan supercars, GTA for high-performance Alfa Romeos (or car-theft video games, or metropolitan Toronto)... The list goes on and on, but few are as familiar with the idea as Volkswagen, which uses the letters GTI for hot hatches, GTD for their diesel counterparts, and most recently, GTE for plug-in hybrids.